function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		tn_home = newImage("/images/htn_home.gif");
		tn_about = newImage("/images/htn_about.gif");
		tn_clients = newImage("/images/htn_clients.gif");
		tn_specialty = newImage("/images/htn_specialty.gif");
		tn_express = newImage("/images/htn_express.gif");
		tn_specials = newImage("/images/htn_specials.gif");
		tn_artwork = newImage("/images/htn_artwork.gif");
		tn_promotional = newImage("/images/htn_promotional.gif");
		tn_contact = newImage("/images/htn_contact.gif");
		preloadFlag = true;
	}
}